Frog External Morphology & Adaptations — NEET Biology
📚 Practice ConceptBody of a frog is divisible into head and trunk. A neck and tail are absent. Above the mouth, a pair of nostrils is present. Eyes are bulged and covered by a nictitating membrane that protects them while in water. On either side of eyes a membranous tympanum (ear) receives sound signals. The forelimbs and hind limbs help in
Which of the following statements regarding the sense organs and feeding in frogs are NOT correct? S1: The tympanum in frogs is an external structure that functions only for receiving sound signals. S2: Nictitating membrane covers the bulged eyes, providing protection while the frog is in water. S3: Frogs possess well-organized internal ears, but external ears are absent. S4: The organs of touch, taste, and smell in frogs are simple cellular aggregations around nerve endings, unlike eyes and internal ears which are well-organized structures. S5: Maxillary teeth in frogs are primarily used for masticating food before swallowing.
View solution & NCERT explanation
Correct answer: A — S1 and S5
Let's evaluate each statement regarding the sense organs and feeding in frogs based on NCERT content. S1: "On either side of eyes a membranous tympanum (ear) receives sound signals." and "The ear is an organ of hearing as well as balancing (equilibrium)." This statement is incorrect because the tympanum functions for both hearing and balancing, not only for receiving sound signals. S2: "Eyes are bulged and covered by a nictitating membrane that protects them while in water." This statement is correct, describing the protective function of the nictitating membrane. S3: "External ear is absent in frogs and only tympanum can be seen externally. The ear is an organ of hearing as well as balancing (equilibrium)." This statement is correct, confirming the absence of external ears but presence of internal ear components represented by the tympanum. S4: "Frog has different types of sense organs, namely organs of touch (sensory papillae), taste (taste buds), smell (nasal epithelium), vision (eyes) and hearing (tympanum with internal ears). Out of these, eyes and internal ears are well-organised structures and the rest are cellular aggregations around nerve endings." This statement is correct, differentiating between well-organised structures and cellular aggregations. S5: "Food is captured by the bilobed tongue." The NCERT text does not mention maxillary teeth being used for masticating food in frogs. Frogs typically swallow their prey whole. Therefore, this statement is incorrect. Statements S1 and S5 are not correct. Final Answer is A as it correctly identifies S1 and S5 as not correct.
What does NCERT say about Body frog divisible into?
Has this concept appeared in NEET?
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Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.